Question

What is the average acceleration of a southbound train that slows down from 15 m/s to 8.6 m/s in 1.2 s?

Answer 1

The average acceleration of train is
`5.34\ m/s^2`

Explanation:

We have,

A train that slows down from 15 m/s to 8.6 m/s in 1.2 s. It means that 15 m/s is its initial velocity and 8.6 m/s is its final velocity.

It is required to find the average acceleration of the train.

`a=(v-u)/(t)\\\\a=((8.6-15)\ m/s)/(1.2\ s)\\\\a=-5.34\ m/s^2`

The average acceleration of train is
`5.34\ m/s^2`. Negative signs shows that the train is decelerating.